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Kewal Shah
Asked: 2018-11-08 02:01:28 +0800 CST

Duplicate icons of the same application created on Dock with no WM_class found

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I followed all the steps in this answer: https://askubuntu.com/a/975230/719469

However when I run xprop WM_CLASS in Terminal and click on my application's window, it gives me: WM_CLASS: not found. What should I do to get a single icon of the app on the Ubuntu Dock?

duplicate icons on Recoll on Launcher

The application I am talking about is Recoll, installed using apt-get install recoll. I am using Ubuntu 18.04 (Xorg).

The contents of .desktop file in /usr/share/applications:

[Desktop Entry]
Categories=Utility;Filesystem;Database;
Comment=Find documents by specifying search terms
Exec=recoll
GenericName=Local Text Search
Icon=recoll
Name=Recoll
Terminal=false
Type=Application
Keywords=Search;Full Text;

Edit:

I tried changing the .desktop file lines by making these changes

Exec=recoll --class CustomClassName

and then adding the line

StartupWMClass=CustomClassName

After doing this, the app fails to launch from its icon and I still get WM_CLASS: not found. in the terminal

icons .desktop ubuntu-dock recoll xprop

1 Answers

  1. For a similar situation I have to do the following:

    1. Determine the class as in the new answer in related question

      Briefly:

      • open the app
      • AltF2, write lgEnter, go to Windows menu (up-right).
      • find the app in the list and take note of its wmclass
      • close app

    2. Add class to .desktop file

      StartupWMClass=classSeenInPreviousStep

      Normally in: /usr/share/applications or .local/share/applications

    3. keep icon in favorites (add to menu)

      • open app, right button in icon, 'Add to favorites'. If this fails, check that in .desktop Terminal=false

      • or: open dconf-editor, search favorite-apps, add .desktop file to list

      • or: Paste this to create a script for that purpose

        cat >addToMenu.sh <<'EOL'
#!/usr/bin/env bash
STATE=`gsettings get org.gnome.shell favorite-apps`
STATE=$(sed 's/]/,'\ \'YOURAPP.desktop\'']/g' <<< $STATE)
gsettings set org.gnome.shell favorite-apps "${STATE}"
EOL

#  Run it:
sudo apt install gnome-shell-extensions
bash addToMenu.sh
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